[llvm] [AMDGPU][DAG] Enable ganging up of memcpy loads/stores for AMDGPU (PR #96185)

[Fabian Ritter via llvm-commits]

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ritter-x2a wrote:

Like this, in `memcpy-sreg.ll`? The previous, more verbose `memcpy-param-combinations-sreg.ll` is removed again.

https://github.com/llvm/llvm-project/pull/96185